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Scientific Linux Security Update : kernel on SL5.x i386/x86_64 (20161028) (Dirty COW)
high Nessus Plugin ID 94432
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Synopsis
The remote Scientific Linux host is missing one or more security updates.Description
Security Fix(es) :- A race condition was found in the way the Linux kernel's memory subsystem handled the copy-on-write (COW) breakage of private read-only memory mappings. An unprivileged, local user could use this flaw to gain write access to otherwise read-only memory mappings and thus increase their privileges on the system.
(CVE-2016-5195, Important)
- It was found that stacking a file system over procfs in the Linux kernel could lead to a kernel stack overflow due to deep nesting, as demonstrated by mounting ecryptfs over procfs and creating a recursion by mapping /proc/environ. An unprivileged, local user could potentially use this flaw to escalate their privileges on the system. (CVE-2016-1583, Important)
Bug Fix(es) :
- In some cases, a kernel crash or file system corruption occurred when running journal mode 'ordered'. The kernel crash was caused by a NULL pointer dereference due to a race condition between two journal functions. The file system corruption occurred due to a race condition between the do_get_write_access() function and buffer writeout. This update fixes both race conditions. As a result, neither the kernel crash, nor the file system corruption now occur.
- Prior to this update, some Global File System 2 (GFS2) files had incorrect time stamp values due to two problems with handling time stamps of such files. The first problem concerned the atime time stamp, which ended up with an arbitrary value ahead of the actual value, when a GFS2 file was accessed. The second problem was related to the mtime and ctime time stamp updates, which got lost when a GFS2 file was written to from one node and read from or written to from another node. With this update, a set of patches has been applied that fix these problems. As a result, the time stamps of GFS2 files are now handled correctly.
Solution
Update the affected packages.See Also
Plugin Details
Severity: High
ID: 94432
File Name: sl_20161028_kernel_on_SL5_x.nasl
Version: 2.13
Type: local
Agent: unix
Published: 10/31/2016
Updated: 3/8/2022
Supported Sensors: Nessus Agent, Nessus
Risk Information
VPR
Risk Factor: Critical
Score: 9.8
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 6.3
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 7.5
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C
Vulnerability Information
CPE: p-cpe:/a:fermilab:scientific_linux:kernel, p-cpe:/a:fermilab:scientific_linux:kernel-pae, p-cpe:/a:fermilab:scientific_linux:kernel-pae-debuginfo, p-cpe:/a:fermilab:scientific_linux:kernel-pae-devel, p-cpe:/a:fermilab:scientific_linux:kernel-debug, p-cpe:/a:fermilab:scientific_linux:kernel-debug-debuginfo, p-cpe:/a:fermilab:scientific_linux:kernel-debug-devel, p-cpe:/a:fermilab:scientific_linux:kernel-debuginfo, p-cpe:/a:fermilab:scientific_linux:kernel-debuginfo-common, p-cpe:/a:fermilab:scientific_linux:kernel-devel, p-cpe:/a:fermilab:scientific_linux:kernel-doc, p-cpe:/a:fermilab:scientific_linux:kernel-headers, p-cpe:/a:fermilab:scientific_linux:kernel-xen, p-cpe:/a:fermilab:scientific_linux:kernel-xen-debuginfo, p-cpe:/a:fermilab:scientific_linux:kernel-xen-devel, x-cpe:/o:fermilab:scientific_linux
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/RedHat/release, Host/RedHat/rpm-list
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 10/28/2016
Vulnerability Publication Date: 6/27/2016
CISA Known Exploited Vulnerability Due Dates: 3/24/2022
Exploitable With
CANVAS (CANVAS)
Core Impact
Reference Information
CVE: CVE-2016-1583, CVE-2016-5195
IAVA: 2016-A-0306-S